the chemical formula of sodium chloride is NaCl but the chemical formula of zinc chloride is zncl2 why is it so explain

Dear student,
The formula of Sodium chloride is NaCl and the formula of Zinc chloride is ZnCl2 , this is due to difference in the valencies of Sodium and Zinc.
The valency of sodium is 1 and that of Zinc is 2.
Due this variation there is difference in the formula of the respective chlorides.

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